What do you mean by "didn't get a chance to choose my character at the beginning like I should have"? If you're talking about your starting frame you should have been able to choose from 3 possibilities: Excalibur, Loki and Mag.If you're not happy with your choice, you will either have to create a new account or farm for new warframe parts...

don't know about this, sorry. I didn't skip mine. You have to use the weapons she tells you. You can't melee when she tells you to use the secondary weapon(for example). What happens if you log out and log back in??

Why would you skip the tutorial to begin with? You can't delete your "character" since you need one at all times. If you got into the game already and you have one, you can either go with it (since you already messed up) and get the pieces for a new one, or create a new account. No other option there.

i found out that i could reset my account and that's what I did. the problem is that when you choose your original character, there's no "are you sure" pop up, so if you click by accident, you are stuck with that character